The crane runway beam section shall be set in such a way that the top flange is
wider and thicker than the bottom flange, but when doing this, users shall avoid
the case like A2 + A3 < A1 , where
A1 = top flange area
when there is cap channel, A1 = top flange area + channel section area
A2 = bottom flange area
A3 = web area
When A2 + A3 < A1 , the plastic neutral axis moves
to top flange range and it's not recommended by the program.
The program will flag NG in this check when A2
+ A3 < A1 .
User can increase the bottom flange and web thickness to pass this section check.